ever since foreign ministers closed the nuclear deal with iran, ten days ago, the obama administration has been trying to win over a skeptical congress and stave off new sanctions. today, wendy sherman, the lead u.s. negotiator in geneva, held a closed briefing today for members of the house. republican trent franks of arizona is among the lawmakers who have called the agreement a bad deal. >> seems like there's general notion that we're afraid to allow iran to question our sincerity when we should be questioning theirs. iran has given no concession of any kind for 30 years. and yet we are now taking some of our most powerful inducements off the table. >> ifill: michigan democrat dan kildee was milder in his criticism, but he said the u.s. has to proceed very carefully. >> we have to be very cautious with this state, and very skeptical and realize that the reason that we're in the position we're in right now, is that the sanctions are working, and the sanctions need to be not just seen only as a penalty, but as an inducement to better behavior. >> ifill: under the agreement, a limited